The frame is hollow right through. You run a cable over the aluminum bb shell inside the frame. If you take the fork off, you can run a fishing cable from the head tube all the way out the back hole of the chainstay. See my internal install on my '06 R3. I used the full internal cabling harness and mounted the battery under the bb.

No jb when using full internal shimano cable, just a small rectangular join point. You fish the whole harness with the join point from the front of the bike through the open head tube (once fork is removed) and pull all the way through the frame. Use fish lines ( I use brake cables) to pull the appropriate cable end through the right hole in the frame.

Ok GoodboyR, reading this I finally imagine how you were able to install the rectangular join point into the R3 with drilling a big hole as the one shown on Cervelo document for DI2 intslaa on S3/S2!I own exactly the same 2006 R3 as yours. There are remaining questions before stepping to an DI2 install : how do you manage to connect the RD cable to the junction box without pulling cables through a hole in BB area?Same question applied for other cables.Like you have done, I plan to install a battery in the seatpost as what is selle on EBAYhttp://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=290700600796&ssPageName=ADME:X:RTQ:US:1123Is it easy to install that way?Thank in advance for explanation and sorry for My english, cause I'm french.

Two options:1. Connect all cables together first, and attach fishing wires to each end and then run them through the appropriate holes. But this is difficult.2. The easier way is as you describe. Dremel a small port in the aluminum BB shell, and use that to do the final connections. Dura Ace cabling is thicker than ultegra so this would be the way to go.

As for the internal battery, you just need to splice sufficient cable and a connector to the battery line of the harness.

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